Plate-annealing hood



Patented July 20, 19216.

UNITED STATES PATENT OFFICE.

GUSTAV A. HASSEL, 0F MCKEESPORT, lPENNSYLVANIA, `ASSIGNOR TO.PITTS`.BURGHI STEEL FOUNDRY CORPORATION, OF GLASSPORT, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

Application filed September 1, 1925.

This invention relates to annealing pots or boxes, and particularly to a hood for resting upon the bottom and covering the material during the annealing process.

As is well known to those familiar with :this art, these hoods are subjected to intense heat, and considerable Vdiiiiculty has been experienced in the warping and distortion of the sides and tops of such structures. To overcome these difiiculties to some extent, resort has been had to corrugating the hood at spaced intervals with the corrugations extending throughout both the sides and top, or to the use of tubular bracing portions in connection therewith. With extremely high temperatures such corrugated hoods have proved unsatisfactory, rapidly becoming distorted to an extent rendering them unfit for use, while on the other hand the formation of tubular bracing parts of the character above noted because of the diiiiculty in the removal of the necessary cores employed during the fabrication of the hood renders the latter type expensive and greatly increases the weight thereof.

It has been found that by providing a comparatively narrow bridge wall forming a substantial continuation of the body of the hood for connecting the opposite sides of the customary corrugations, locating the bridge wall at a short distance fromthe lower edge of the hood, and thickening the crests of the corrugations as wel] as the intermediate zones of the curved portions of the body joining the end and si-de walls thereof, a structure results which will not only withstand rigorous duty under intense heat without the sagging of the top and distortion of the side walls` but one which can be readily fabricated without the difficulties previously mentioned attending the removal of cores. It is an object of the invention to provide a hood including these features for the purpose of overcoming the objections heretofore r noted incident to hoods now in common use.

In the accompanying drawings, Fig. 1 is a fragmentary view, in side elevation, illus* trating the preferred embodiment of the invention; Fig. 2 a fragmentary plan view of one end of the hood illustrated in Fig. 1; and Fig. 3 a vertical transverse sectional view galten substantially on the line III-III of The hood illustrated in the drawings con- PLATE-ANNEALING HOOD.

Serial No. 53,8 15.

forms generally to hoods now in common use, and includes the opposite side walls 1 and 2, the opposite end walls 3 and 4, and the top wall 5, all integrally formed vand together constituting a unitary structure. Thebottom edge of the hood is indicated at 6, and is adapted to rest upon and cooperate with the bottom member of the annealing box, all as will be readily understood by those familiar with this art.

The side walls are provided at spaced intervals, with the corrugations 7, 7, 7 7 and 7, all as clearly illustrated in Fig. l, the said corrugations extending from a point adjacent the bottom edge 6 of the side wall 1 completely over the top 5, and the side wall 2, terminatingv adjacent the lower edge of the last`named wall. The end wall 3 is provided with one or more similar corrugations such as indicated at 8, and the opposite end wall 4 with corrugations such as shown at 9.

The crests or the portions intermediate the sides of the corrugations joining the body of the hood are slightly thicker than at their remaining points, which feature is clearly illustrated in Figs. 1 and 2 of the drawings, in which the said crests have been indicated by the same reference numeral as that used f for designating the corrugation of which it forms a part with an added exponent a The curved portions joining the side, end and top walls have also been somewhat thickened at their intermediate zones, as indicate-d in the drawings by the several reference numerals 10, 11, 12, 13, 14C and 15. In other words, the curved portions joining the several walls are made somewhat thicker at their intermediate portions than at the portions thereof immediately joining the main body of the hood.

Disposed upon the interior of the hood is a comparatively narrow bridge wall such as indicated in the drawings by the numeral 16 which connects the opposite sides of the corrugations, at a point slightly above the lower edge of the hood. Preferably, each of the corrugations of the side walls are equipped with such a bridge wall, and the corrugations in the end walls may also be equipped therewith, if desired. As previously stated, the bridge wall 16 is comparatively narrow, terminating short of both the bottom and top portions of the side walls, and is disposed in proximity to the lower edge of the hood,; being spaced but ar short distance thereabove, as clearly shown in Fig. 3 of the dra-wings.

For convenience in handling, the hood may be' equipped withLt-he customary laterally projecting lifting lugs indicated at 17, 17 and 18, and with,6 strengthening ribs such as shown at 19, if desired.

As noted at the outset of this specification, by constructing the hood in the manner described, it has been found that the same will effectively withstand the rigorous duties to which it is subjected, without objectionable sagging of' the topand` distortion and warping of the sidewalls, so frequently encounteredin structuresv heretofore' commonly employed; It is also noted, that'in the-fabrication of the hood, the bridge walls 16 may be readily made and the coresemployed for this purpose very easily removed.

The preferred embodiment ofthe invention has been illustrated and described, as required by the patent statutes; It is obvious, however, thatv many changes in detail and in the arrangement of partsv may be made without departing fromV the spirit of the invention, and it isv therefore not intended to limit the inventionv bevond that particularly defined by the appended claims.

I claim:

1'. A hoody for annealing boxes comprising side walls provided with. spaced corrugat-ions formed therein, a bridge wall forming a substantial continuation of lthebody of the hood disposed upon the interior thereof and connecting the opposite sides of the corrugations, said bridge wallterminatingf short of both the bottom edges and top of the hood and disposed adjacent the said lower edge.

2. A hood for annealing boxes comprising a top, end and side-walls, provided with spaced corrugations having concaved inner surfaces formingcontinuing wall portions with said top, end and sidewalls, the metal forming said corrugations being of greater thickness at the crests of the corrugations.

3. A hood for annealing boxes comprising a top, end and side walls provided with spaced corrugations formed therein, the said end and side walls being joined to the said top by curve portions, the metal forming said corrugations being of greatest thickness at the crests of the corrugations and the metal forming said curved portions being of greater thickness at their intermediate Zones than at their points of immediate iuncture with the said walls.

A hood for annealingl bores comprising a top, end and side walls provided with yspaced corrugations formed therein, the top,

end and side walls beingjoined by curved portions, the crests of said corrugations and the intermediate zones of said curved portions being of greater thickness than the remaining parts thereof, a bridge wall ltorming a substantial continuation of the body ofthe hood positioned upon the interior of the hood connecting the opposite side edges of the corrugations, said bridge wall being disposed in the proximity ofthe lower edge ofl the hood and at a point intermediate its top and bottom portions.

In testimony whereof, I sign my name.

GSTAV A. I-IASSEL. 

